[Solved] How does UserPassesTestMixin in django work?

[ad_1] The user id coming from the user in the request object is an integer, while the self.kwargs[‘pk’] is a string unless you do something about it. You’d see the difference if you printed repr() of the values because the string would have quotes around it because it’s extracted from the url path which itself … Read more

[Solved] Incrementing a counter while assigning it in python

[ad_1] Python 3.8+ has the walrus operator, which allows you to assign to a variable within an expression. The expression var := expr assigns the value of expr to var, and results in that same value. This means the pre-increment operator ++var can be simulated in Python by var := var + 1. This increments … Read more

[Solved] Create a list of all the lists whose entries are in a range in Python [closed]

[ad_1] Are you looking for the product of [5, 6, 7] with itself, 57 times? itertools.product() does that for you: from itertools import product for combination in product([5, 6, 7], repeat=57): print combination This will take a while to print all output, however. It’ll eventually print all 3 ** 57 == 1570042899082081611640534563 possible combinations. Don’t … Read more

[Solved] How to I extract objects? [closed]

[ad_1] First load the img from the url import numpy as np import urllib.request from PIL import Image from matplotlib import pyplot as plt urllib.request.urlretrieve( ‘https://i.stack.imgur.com/GRHzg.png’, “img.png”) img = Image.open(“img.png”) img.show() Then consider the black part as “filled” and convert in numpy array arr = (np.array(img)[:,:,:-1].sum(axis=-1)==0) If we sum the rows values for each column … Read more

[Solved] Replace list item with corresponding dictionary value [closed]

[ad_1] Let’s define your variables: >>> d = {‘apple’: ‘2’, ‘banana’: ‘3’, ‘pear’: ‘1’, ‘peach’: ‘1’} >>> x = [‘banana’, ‘apple’, ‘pear’, ‘apple banana’] Now, let’s compute the results: >>> [sum(int(d[k]) for k in y.split()) for y in x] [3, 2, 1, 5] >>> sum(sum(int(d[k]) for k in y.split()) for y in x) 11 Or, … Read more

[Solved] Decimal Subtraction [closed]

[ad_1] So your code bugged me alot. I made some changes to make things more pythonic… Instead of separate lists for your menu, I made it a list of tuples containing the product and it’s price I fixed your float casts There’s alot to be done for example, catching errors on invalid inputs, checking for … Read more

[Solved] `else` branch only pair to its nearest ‘if’

[ad_1] Of course it does – the closest if with matching indentation, which is how Python compiles. It wouldn’t make sense in your example: if x < y: print(f'{x} is less than {y}.’) if x > y: print(f'{x} is greater than {y}.’) else: print(f'{x} is equal to {y}.’) for the else to reference x<y, from … Read more

[Solved] Replacing part of string python [closed]

[ad_1] For the simplest case, you might solve this with a regular expression: >>> import re >>> re.sub(r”(‘?null’?)”, “‘Null'”, “{‘abcd’: null}”) “{‘abcd’: ‘Null’}” >>> re.sub(r”(‘?null’?)”, “‘Null'”, “{‘abcd’: ‘null’}”) “{‘abcd’: ‘Null’}” >>> but from the look of you example and the comment (which should really be part of your question) mentionning you might have a lot … Read more